Step 1

Combine butter and marshmallows in a mircrowave-safe bowl. Cook for 1-1½ minutes or until the butter and marshmallow are just melted, no longer.

Step 2

Stir in vanilla extract and add potato chips, folding until chips are coated with the marshmallow.

Step 3

Press into a greased 8x8" pan and let cool. Cut into 12 squares.